You’re ignoring the fact that you need accessories that will up your cost to the 100$ range. Either way, fine, there are now 4 and 5th gen HP Mini PCs selling for 50-70$. Want even cheaper then look for i3 CPU + 4 GB of RAM, you’ll find 40$ complete machines that run faster and are way better than a Pi. All of those options come with power adapters and all the things required to get it going.